First version of builder

.gitea/workflows/build.yaml

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+name: Embedded builder creation
+run-name: ${{ gitea.actor }} is building the embedded-builder docker image
+on: [push]
+env:
+  BUILD_IMAGE: git.firebee.nl/${{ gitea.repository_owner }}/embedded-builder
+
+jobs:
+  Embedded-Builder-Image:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+
+      - name: lowercase conversion
+        run: echo "BUILD_IMAGE_LC=${BUILD_IMAGE,,}" >>${GITEA_ENV}
+        
+      - name: Extract Docker image metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.BUILD_IMAGE_LC }}
+
+      - name: Log in to Firebee registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.firebee.nl
+          username: ${{ vars.BUILDER_USERNAME }}
+          password: ${{ secrets.BUILDER_PASSWORD }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v6
+        with:
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: 
+            - ${{ steps.meta.outputs.tags }}
+            - latest
+          annotations: ${{ steps.meta.outputs.annotations }}
+          provenance: true
+          sbom: true

Dockerfile

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+FROM debian:latest
+RUN apt-get update && apt-get install -y \
+  cmake \
+  gcc-arm-none-eabi \
+  nodejs \
+  npm \
+  && rm -rf /var/lib/apt/lists/*
+
+# node and nodejs are needed for the checkout job in the gitea runner